There this hie where this gut ends up in equestria but the racist ponies refuse to give him a chance and although the main 6 start of giving him a chance their neighbors hating on them makes them change their behavior and try to exculd him. He saves princess Celestia which causes everyone to rethink their behavior especially the main 6 when they realize he thought of them as friends and they blew it. They get captured and spike convinces the human to help save them and eventually he returns home.

Oof. There's a lot that meet that exact description.

Narrow it down, if you can.
Did any other characters feature in notable or recurring ways?
Like, were there repeated scenes of Blueblood being racist or Lyra being weird, for instance?
Was there a notable ally or antagonist?
Any particular nonpony representation in the plot?

Sounds like Equestria's First Human.

Sounds like Equestria's First Human to me.

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I remember that the head bad guy used to know Celestia and because she someone who killed his family off the hook he ploted revenge.

Thanks evil and Samos you hit the nail on the head.

This soubds familiar as hell..... did he like rock/metal and involve a hydra?